now at your 'Download' page is available only version 3.0.
Yes, it's the latest release. I am working these days on 3.0.1. It's not yet released.
I created 3 forums, but only one of them is visible and rest are looks like no exist. In DB there are all. How to make visible all forums I need?
Make sure you didn't touch this in setup_options.php:
if it has the value of 1, set it to 0.
Read manual for more of what this setting means and what for it should be set up.